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  <title>Document</title>
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<body>
  <div class="container">
    <h2>Message消息提示</h2>
    <div class="btn-group">
      <button class="button" id="btn-success">成功</button>
      <button class="button "id="btn-warning">警告</button>
      <button class="button"id="btn-info">消息</button>
      <button class="button"id="btn-error">错误</button>
    </div>
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